Structure of the singular ring in Kerr-like metrics
Structure of the singular ring in Kerr-like metrics
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类克尔度量中奇异环的结构
DOI:
10.1103/physrevd.101.104048
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发表时间:
2020
影响因子:
5
通讯作者:
Yunes, Nicolás
中科院分区:
文献类型:
--
作者:
Chruściel, Piotr T.;Maliborski, Maciej;Yunes, Nicolás
The Kerr geometry is believed to represent the exterior spacetime of astrophysical black holes. We here reanalyze the geometry of Kerr-like metrics (Kerr, Kerr-Newman, Kerr–de Sitter, and Kerr–anti-de Sitter), paying particular attention to the region near the singular set. We find that, although the Kretschmann scalar vanishes at the singular set along a given direction, a certain combination of curvature invariants diverges regardless of the direction of approach. We also find that the two-dimensional geometry induced by the spacetime metric on the orbits of the isometry group also possesses a singularity regardless of the direction of approach. Likewise, the two-dimensional geometry in the directions orthogonal to the isometry orbits is-divergent, but extends continuously at the singular set as a cone with opening angle. We conclude by showing that tidal forces lead to infinite stresses on neighboring geodesics that approach the singular set, destroying any such observers in finite proper time. Those geodesics that come in from infinity and do not hit the singular set but approach it are found to need tremendous energy to get close to the singular set, experiencing an acceleration transversal to the equatorial plane which grows without bound when the minimal distance of approach goes to zero. While establishing these results, we also present an alternative description of some other known properties, as well as introducing toroidal coordinates that provide a hands-on description of the double covering for the geometry near the singular set.
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影响因子:
5
作者:
R. Coquereaux;A. Jadczyk
通讯作者:
A. Jadczyk
影响因子:
5
作者:
W. Israel
通讯作者:
W. Israel
DOI:
10.1063/1.4915290
发表时间:
2014
期刊:
arXiv: Mathematical Physics
影响因子:
--
作者:
A. Tahvildar
通讯作者:
A. Tahvildar
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
A. Hoang;T. Nam
通讯作者:
T. Nam
DOI:
10.4310/sdg.2005.v10.n1.a5
发表时间:
2005
期刊:
Surveys in differential geometry
影响因子:
--
作者:
V. Moncrief
通讯作者:
V. Moncrief